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In Fig. 10.13, X Y and XprimeYprime are ...

In Fig. 10.13, `X Y` and `XprimeYprime` are two parallel tangents to a circle with centre O and another tangent AB with point of contact C intersecting `X Y` at A and `XprimeYprime` at B. Prove that `/_A O B"\ "="\ "90o`

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